Which equation represents the line shown in the graph below?
a. y = -5/4 x
b. y = 4/5x
c. y= 5/4x
d. y = -4/5x

Which answers cannot be.
It has a minus slope.
That let's out B and C. They are both wrong. Minus slopes go from lower right to upper left.

How to find out which it is 
Notice that x = 5 and y = -4 is on the given line
So you have two points (0,0) and (5,-4)

slope = (y2 - y1) / (x2 - y1)
slope = (-4 - 0)/ (5 - 0 )
slope = - 4/5

Line
y = - 4/5 x <<<< answer